Insurance coverage of prescription drugs and the rural elderly.
D000368:Aged; D005382:Financing, Personal / Q000706:statistics & numerical data; D005102:Health Expenditures / Q000706:statistics & numerical data*; D006306:Health Surveys; D006801:Humans; D019458:Insurance Coverage / Q000706:statistics & numerical data*; D017054:Insurance, Medigap / Q000706:statistics & numerical data; D007356:Insurance, Pharmaceutical Services / Q000706:statistics & numerical data*; D006278:Medicare / Q000706:statistics & numerical data; D019035:Rural Health Services / Q000191:economics*; D014481:United States; D019037:Urban Health Services / Q000191:economics*